Measurement of the influence of titanium hip prosthesis on therapeutic electron beam dose distributions in a novel pelvic phantom

Ade, Nicholas; Plessis, F.C.P. du

doi:10.1016/j.ejmp.2017.09.118

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…The linear and mass attenuation coefficient of Nylon-12 were not done due to having access to a small piece (prostate piece). However, in the literature, a difference of 1.5 % was found between the mass attenuation coefficient of Nylon-12 (0.0458 cm 2 /g) and RW3 slabs (0.0465 cm 2 /g) [16].…”

Section: Resultsmentioning

confidence: 84%

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Comparing film measurements and Monte Carlo simulations of dose delivered in a pelvic phantom with titanium hip prosthesis

Dumela,

Oderinde,

Usman

2023

J. Phys.: Conf. Ser.

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An increasing number of elderly prostate cancer patients with high-density material hip prostheses are referred for external beam Radiotherapy (EBRT). Radiation treatment of pelvis cancer patients with high-density hip prostheses needs special attention due to the artifacts created in the computed tomography (CT) field of view and the radiotherapy dosimetry challenges. This study investigated the pelvic prostate point dose with and without titanium hip prosthesis using a 0.6 cc PTW Farmer ionization chamber, EBT3 Gafchromic films, compared with the EGSnrc Monte Carlo (MC) simulation dose distribution. The doses were measured and simulated in a locally made pelvic phantom. MC and measured doses were compared with the Treatment Planning System (TPS) calculated prostate point dose. The ionization chamber, EBT3 Gafchromic films, and MC doses have a maximum deviation of 6.3 %, 5.7 %, and 7.4 % for 6 MV and 4.2 %, 4.7 %, and 5.5 % for 15 MV photon beam, respectively, when compared with TPS calculated dose. There is a significant difference between the prostate point dose measured with ionization chamber, EBT3 Gafchromic film in comparison MC simulated doses. The MC simulation dose shows the highest deviation especially on the lateral field passing through the prosthesis.

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Section: Resultsmentioning

confidence: 84%

“…Ade et al, [16] reported the RW3 slab linear attenuation coefficient of 0.0486 cm -1 and the mass attenuation of 0.0465 cm 2 /g measured for 6 MV photon beam. These materials (dental wax and superflab bolus) were chosen as they are regularly used in radiotherapy to compensate for missing tissue.…”

Section: Resultsmentioning

confidence: 99%

Comparing film measurements and Monte Carlo simulations of dose delivered in a pelvic phantom with titanium hip prosthesis

Dumela,

Oderinde,

Usman

2023

J. Phys.: Conf. Ser.

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“…The enhancement in dose at tissue-metal interfaces due to electron contamination is known to be dependent on a number of factors such as thickness and width of interface, design and atomic composition of the interface, thickness of medium overlying the interface, field size as well as the differences in multiple scattering of secondary electrons and the incident beam energy (Figure 7) (Ade & Du Plessis, 2017;Chatzigiannis et al, 2011). Yet, in this study, bit depth is the only variation that seems to influence the dose distribution.…”

Section: Discussionmentioning

confidence: 99%

Dosimetric Comparison between Monaco TPS and EGSnrc Monte Carlo simulation on Titanium Rod in 12bit and 16bit Image Format

Jayamani

Osman

Tajuddin

et al. 2020

Journal of Radiation Research and Applied Sciences

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This study purpose is to investigate the effects of using different bit depth DICOM images for the 6 MV photon beam on a titanium rod. An EGSnrc Monte Carlo simulation on the Elekta Synergy LINAC executed as a dosimetry comparison tool for the TPS. CT scanners with 12-bit, 12-bit extended (Siemens Somatom Definition AS) and 16-bit depth (Toshiba Aquilion) parameters were applied to scan a wax phantom with a titanium rod. A direct beam (AP) with a field size of 10 x 10 cm2 was prescribed 200 cGy dose and was planned on the MONACO TPS. The TPS outcome was compared with the validated LINAC EGSnrc calculation. The downstream dose of the titanium rod was analyzed for each bit-depth parameters and the limitations of the existing TPS were examined. CT numbers of the titanium rod vary for each bit-depth parameter, where 3071 ± 0 HU, 8513 ± 31 HU, and 10006 ± 73 HU for 12-bit, 12-bit extended, and 16-bit images, respectively. The 16-bit depth scanner gives the most accurate CT number of the titanium rod with the correct dose calculation while, the Monaco TPS underestimates the real titanium rod dose compared to the EGSnrc calculations by 4.95%.

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“…Ade and du Plessis ( 29 ) investigated the perturbation effect of a unilateral titanium prosthesis on the dose distribution of 6 MV and 15 MV photon beams. Using a built-in titanium hip prosthesis, it was observed that the proximal dose enhancement of the prosthesis ranged as 21-23%, and the distal dose reduction of the prosthesis was 18-21% with 6 MV photon beam irradiation.…”

Section: The Effect Of Different Kind Of Metal Implants On Dosagementioning

confidence: 99%

The impact of metal implants on the dose and clinical outcome of radiotherapy (Review)

Liang,

Xu,

Tang

et al. 2024

Mol Clin Oncol

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Radiotherapy (RT) is one of the most widely used and effective cancer treatments. With the increasing need for organ reconstruction and advancements in material technology, an increasing number of patients with cancer have metallic implants. These implants can affect RT dosage and clinical outcomes, warranting careful consideration by oncologists. The present review discussed the mechanisms by which different types of metallic implants impact various stages of the RT process, examined methods to mitigate these effects during treatment, and discussed the clinical implications of metallic implants on RT outcomes. In summary, when metallic implants are present within the RT field, oncologists should carefully assess their impact on the treatment.

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Measurement of the influence of titanium hip prosthesis on therapeutic electron beam dose distributions in a novel pelvic phantom

Cited by 8 publications

References 32 publications

Comparing film measurements and Monte Carlo simulations of dose delivered in a pelvic phantom with titanium hip prosthesis

Comparing film measurements and Monte Carlo simulations of dose delivered in a pelvic phantom with titanium hip prosthesis

Dosimetric Comparison between Monaco TPS and EGSnrc Monte Carlo simulation on Titanium Rod in 12bit and 16bit Image Format

The impact of metal implants on the dose and clinical outcome of radiotherapy (Review)

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